Variable-speed governor



Oct. 12 1926.

F', 0. l CHORLTON VARIABLE SPEED GOVERNOR Filed July 1 1925 Patented Get. 12, ieaa FRANK OSCAR LEV'IY crroanroai, or BURY, EN A D.) a

: VARIABLE-SPEED GOVERNOR.

Application filed July 21,1925, Serial No. 45,138, 'and'in Great Britain Ju1y 25, 1924.

The invention relates to a governor-ball type of governor operating against an external load or resistance applied through a lever device, which is capable of'use -in those cases where a considerable range-of speed has to be provided for, as for example when the prime mover is employed for driving a rolling mill, or for driving a paper making machine. j p

In these instances, it is desirable, as in ordinary types of governors, for any particular speed to be maintained for the time being, with very little deviation, however the load upon the prime mover may alter within known limits. The invention consists in combining a lever device with a variable fulcrum thereat whereby the applied loadin the'form of a spring, upon the governor, is capable of being altered at will, to conform to the conditions of the governor for an altered speed,

with a device which is arranged to vary the radial distance ofthe governor balls in addi tion. As, in the double event, the resulting speed of the governor changes at a different rate for the two operations named, it be.

comes possible to adjust the mechanism used whereby the desired conditions are attained.

, With reference tothe accompanying drawings,Fig. 1 is a sectional elevation of a high speed governor, suitable for being driven from a prime mover, provided with means according to my invention for varying an applied spring load thereon, and at the same time, altering the distance of the governor balls apart to suit. Fig. 2 is a section through line 22 of a detail in Fig. 1, some 0 parts being left in elevation.

V a is a fixed casing in connection with the engine frame, not shown, but which casing is by no means necessary. I) isthe governor spindle which is assumed to be driven from the prime mover in any well known manner. 0 is a cross bar attached to spindle b, and

' pivoted or fulcrumed at d is an ordinary,

bell-crank lever e, in each; case, carrying attached governor ball h. is is a loose sleeve upon spindle b as is well understood, and which is in link connection shown with the levers e. A non-rotating collar within a groove in is is indicatedat p.

As illustrated, the lever device a pivoted at one end by a pin mto the collarfp, the hole in said collar for m being assumedsufiiciently larger to allow the requisite vertical movement of the end concerned of the lever n described, there being here one on each 1 side of collar p.

The parts t are capable of being moved along the length of lever n or are here mounted upon a piece or cross-head u, ex-' tended lower portions of which are, engaged by guides v projecting from casing a.

lug or projection w from u is screw-threaded so as to be engaged by anfinclined screwthreaded'spindle a; passing through the same.

or turned by attached wheel 3 8 is the usual or common spring device for supplying the applied load to the governor,

which is arranged to be initially compressed to a degree suitable by means indicated.

It will be seen that on the turning of the spindle w the position of pin or fulcrum Z is altered along the length of the lever '11 and that on account of said pin Z being also moved more or less in a vertical dlrection Said spindle w is capable of being operated due to the inclination of mount for said spindle mfthe sleeve, is and therefore levers e v are operated, with the result that the radial distance of the balls 7 relative to the aXis of j b is increased or decreased as the case may be.

By adjustment of these two factors, the

desired conditions may be attained as already described.

The spindle device a; is merely shown as I a convenient means for movlng the fulcrum the prime mover,,or mechanism the govern ing of which is desired.

The arrangement illustrated brings about the condition that the mean working tension of the spring 8 is constant for the range of speeds for which the governor is designed. I

This becomes possible by reason ofthe facts i that the higher the speed of mechanism to I be controlled, the nearer together the balls h are brought by the operation of the downwardly inclined screw spindle 00, and vice versa, and the ratio of lengths into which the lever n is divided by the fulcrum Z is arranged to be such, that the pressure at the governor end of said lever is inversely proportional to said ratio.

I claim V In a variable-speed governor of the go"- ernor-Weight type, and for controlling mechanism related to a prime mover, a spring loaded lever connected at one end to the spring forming said load, and at the other end to a movable part of the governor for controlling the radial distance of the governor Weights referred to, a reduction of'radial distance aforesaid corresponding to an increase of speed, and vice versa, a

fulcrum piece slidably mounted on said lever for being moved along a plane inclined to said lever, a hand controlled device for so moving the fulcrum piece, said fulcrum capable of dividing the lever aforesaid into lengths the ratio of Which is such that the pressure at the governor end of said lever is inversely proportional to said ratio, resulting in the mean Working tension of the spring load remaining constant for all Working positions of the governor, substantially as herein set forth.

In testimony whereof I have affixed my signature.

FRANK OSCAR LEVI CHORLTON. 

